Dynamic IPv6 (DHCPv6) at WAN not working

[DavidRdx]

Since I did upgrade to OPNSense 17.1.2 I don't get IPv6 address anymore on my WAN side from the ISP.
This has been configured with DHCPv6 on WAN side and using Tracking Interface on LAN part.

Anyone got idea why this stopped working?
The previous version was 17.1.1 there it worked.

Thanks.